This probably isn't the best place to as the question as its really a place for tree managers to post their queries about the Quantified Tree Risk Assessment method and almost all messages are answered by me and my other role is delivering the training.
We run two training workshops both of which run for one day. The first is the Quantified Tree Risk Assessment user training, which involves entering into a licence agreement and paying an annual fee. This is a methodology for people who are regularly assessing the risks from tree failure. From what you've said, I dont think that this is going to be of particular benefit to you.
The second workshop is the Practitioners Guide to Visual Tree Assessment and it sounds as though you would probably gain a great deal from this. The workshop looks at some basic tree anatomy and tree biology with instruction on the interpretation of growth patterns in relation to defects, decay and mechanical stability of trees. We also look at the relationships between fungi and trees.
To get a independant view, you could post your question on the UKTC Tree Care forum where you will almost certainly get a response. [www.tree-care.info